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/* Test for NaN that does not need libm.
Copyright (C) 2007-2024 Free Software Foundation, Inc.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
This file is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* This file uses HAVE_ISNANF_IN_LIBC. */
#if !_GL_CONFIG_H_INCLUDED
#error "Please include config.h first."
#endif
#if HAVE_ISNANF_IN_LIBC
/* Get declaration of isnan macro or (older) isnanf function. */
# include <math.h>
# if (__GNUC__ >= 4) || (__clang_major__ >= 4)
/* GCC >= 4.0 and clang provide a type-generic built-in for isnan.
GCC >= 4.0 also provides __builtin_isnanf, but clang doesn't. */
# undef isnanf
# define isnanf(x) __builtin_isnan ((float)(x))
# elif defined isnan
# undef isnanf
# define isnanf(x) isnan ((float)(x))
# else
/* Get declaration of isnanf(), if not declared in <math.h>. */
# if defined __sgi
/* We can't include <ieeefp.h>, because it conflicts with our definition of
isnand. Therefore declare isnanf separately. */
extern int isnanf (float x);
# endif
# endif
#else
/* Test whether X is a NaN. */
# undef isnanf
# define isnanf rpl_isnanf
extern int isnanf (float x);
#endif
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